William d



(No Model.)

W. D. THOMAS.

FLUID PRESSURE REGULATOR AND GUT-OFF. No. 365,712.

UItl-LEEEEE- N. Finns, Pnawumegmpner. wnhingwm 0.a.

UNITED STATESN ATENT EEICE.

WILLIAM D. THOMAS, OE rITTsnuEe, PENNSYLVANIA, ASSIGNOE To HIM! sELE, EOEEET I. PEEL, AND TIIOMAS n. ATTEEEUEY, ALL or SAME rLAcE.

FLUIDPRESSURE REGULATOR AND CUT-OFF.

` SPECIFICATION forming part of Letters Patent No. 365,712, dated June 28, 1887.

Application tiled March 1B, 1887. Serial No. 231,415.

To all whom it may concern.-

Beit known that l, WILLIAM D. THOMAS, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Fluid-Pressure Regulators and Cut-Offs; and I do hereby de.-

clare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming part of IO this specification, in which- Figure 1 is a side view of the regulator, the side of the box or chamber being removed to show the interior mechanism. Fig. 2 is a vertical longitudinal section through the reg'- |5 ulator-ehamber and the cylinders 3 and 13.

Like symbols ofrefercnce indicate like parts in each.

In the drawings,2 represents the box or case of the regulator. y

3 is the gas-adit pipe, and 4 is the exitpipe. In the pipe 3 is arranged a valve having two faces, 4 and 5, which are screwed to a single stem, 6, and seat in opposite directions on their seats 7. screwed to the stem 6, and are therefore adjustable to vary the distance between them.

When properly adjusted, they are locked by nuts b. The stem 6 is connected at its upper end to a lever, S, which is fulcrumed at a point, 9, and is weighted at 10. The free end of the lever has depending from it a rod, 11, which is 'lixed to a piston or plunger, 1L. The piston or plunger works in a cylinder, 13, which communicates with the case 2.

1l is a rod extending from the piston to the outside of the cylinder 13, and 15 is a ventpipe, which leads from the cylinder to the outer air.

16 is a small by-pass pipe, which leads 4o from the adit-pipe 3, back of the valves land 5, into the chamber 2. It is provided with a cock, 17.

2 shows the regulator working, with gas iowing past the valves into the case and through the pipe 43. The valves'are so held by gas-pressure on the 'piston 12., When the pressure in the case 2 increases, it forces the piston 12 down in the cylinder 13, thus depressing the unweighted end of lever 8 and 5 5 moving the valvc-face 4 nearer to its scat, so as to diminish the gas-flow. If the pressure should fall, the weight 10 drops and raises the valve 4. to admit more gas, and in this (No model.)

way an equilibrium of pressure, depending for amount on the position and gravity of the weight 10, is continually maintained. If the pressure in the supply-pipe 3 should cease altogether, or should fall below the pressure at which the regulator is set, theweight drops and raises the valve 5 to its scat, thus cutting 6,0 oit the gas-llow.

The regulator may be started into operation either by pulling down the rod 14, so as to push the valvevfa'ce 5 from its seat, or it may be started by opening the cock 17. This lets a small supply ot gas into `the case 2 and` dcpresses the piston 12, so as to unseat the valve 5; but ii' there be any considerable leak, `or it' any burner-valves be open in theservice-pipe in advance of the regulator, the gas will es- 77o cape without operating the piston 12, and so will not atl'ect the regulator until the outlets be shut. This is an advantage, because it indicates the condition of the pipes and pre: vents the full gas-supply being turned O11 un- 75 V til the valves have all been shut. The valve-faces 4. and 5 are 'regulator are not new, nor is itnew to suspend I am aware that double-faced valves in a a double-faced valve vertically from a lever and to work the lever with a diaphragm. I 8o therefore do not claim these. My invention consists in the combination of the double faced valve, the lever arranged in the case 2, and the piston 12, connected with the lever, and having the rod 11 projecting from the S5 cylinder 13, wherein the lever works.

I therefore claim- In a fluidpressure regulator, the combina tion, with the case or Vbok 2, of the exit and adit pipes, a doublefaced valve controlling 9o the adit-pipe, a cylinder, 13, communicating with the case or box 2, a piston, 12, in the cylinder, and a lever, S, arranged inside the said case or box and connected with the piston and with the valve, whereby increase of gas-pressure in the case or box moves the piston, and through the lever 8 moves the valve and the stein 14, connected with the piston and project-ing without the cylinder, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 10th day of March, A. D. 1887.

WILLIAM D. THOMAS.

lVitnesses;

J. K. SMITH, It. H. WHITTLEsEY, 

